Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities [Abstract]
Net Income (Loss)	$ (985)	$ (2,441)	$ 1,214
Adjustments to Reconcile Net Loss to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	2,454	2,131	1,759
Asset Impairments	92	533	500
Goodwill Impairment	0	779	0
Dry Hole Cost	579	266	226
Deferred Income Taxes	(984)	116	268
Loss (Gain) on Commodity Derivative Instruments	139	(501)	(976)
Net Cash Received in Settlement of Commodity Derivative Instruments	569	1,009	29
Gain on Divestitures	(238)	0	(73)
Allocated Share-based Compensation Expense	77	86	87
Non-cash Pension Plan Termination Expense	0	82	0
Gain on Debt Extinguishment	(80)	0	0
Undeveloped Leasehold Impairment	93	21	0
Expiration and Amortization of Unproved Leaseholds	55	92	43
Other Adjustments for Noncash Items Included in Income	40	18	17
Changes in Operating Assets and Liabilities, Net of Assets Acquired and Liabilities Assumed
(Increase) Decrease in Accounts Receivable	(164)	453	29
(Decrease) Increase in Accounts Payable	(111)	(364)	318
(Decrease) Increase in Current Income Taxes Payable	(32)	(94)	18
(Decrease) Increase in Other Current Liabilities	(63)	(70)	45
Other Operating Assets and Liabilities, Net	(90)	(54)	2
Net Cash Provided by Operating Activities	1,351	2,062	3,506
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(1,541)	(2,979)	(4,871)
Proceeds from Divestitures	1,241	151	321
Marcellus Shale Acreage Exchange Consideration	(213)	0	0
Cash Acquired in Rosetta Merger	0	61	0
Additions to Equity Method Investments	(8)	(104)	(71)
Distributions from Equity Method Investments	70	0	156
Other	20	0	0
Net Cash Used in Investing Activities	(431)	(2,871)	(4,465)
Cash Flows From Financing Activities
Dividends Paid, Common Stock	(172)	(291)	(249)
Proceeds from Issuance Common Stock	0	1,112	0
Proceeds from facility	1,400	0	0
Repayment of facility	0	(70)	0
Repayment of Term Loan Facility	(850)	0	0
Proceeds from Issuance of Senior Notes, Net	0	0	1,478
Repayment of Senior Notes	(1,383)	(12)	(200)
Repayment of Capital Lease Obligation	(53)	(67)	(55)
Other	(9)	(18)	51
Net Cash (Used in) Provided By Financing Activities	(768)	654	1,025
Increase (Decrease) in Cash and Cash Equivalents	152	(155)	66
Cash and Cash Equivalents at Beginning of Period	1,028	1,183	1,117
Cash and Cash Equivalents at End of Period	1,180	1,028	1,183
Noble Midstream Revolving Credit Facility, due September 20, 2021 | Noble Midstream Partners LP
Cash Flows From Financing Activities
Proceeds from Issuance Common Stock	299	0	0
Revolving Credit Facility
Cash Flows From Financing Activities
Proceeds from facility	0	0	1,050
Repayment of facility	$ 0	$ 0	$ (1,050)